West Coast land instability risks outlined

Area with land instability – including Greymouth, pictured, have been identified and hazard plans for each will be incorporated in the draft Te Tai o Poutini Plan.


Area with land instability – which includes Greymouth, pictured, have been recognized and hazard designs for every single will be included in the draft Te Tai o Poutini Prepare.

West Coasters fearful about the possibility of all-natural occasions these kinds of as earthquakes, large rain, and landslips impacting their home can now present comments on a new pure dangers doc. Local democracy reporter BRENDON McMAHON stories.

New guidelines for new structures and structures in regions determined as being at danger from land instability dangers will use beneath a proposed new program.

This suggests the kind of activity in people places will be reliant on conference discretionary needs in order to create.

This will consist of giving geotechnical assessments and other evidence, such as the proposed constructing exercise becoming protected from slope instability, and will not be probably to outcome in or lead destruction to any adjoining or down slope assets within the purely natural hazard overlay area. 

The draft All-natural Dangers Provisions for Coastal and Land Instability document has been produced utilizing current organic hazard stories held by the West Coastline Regional Council, and the erosion vulnerable areas determined in the council’s Land and H2o Approach.

Go through Far more:
* New West Coastline district system goes out for very first appear
* 7 thousand Nelson houses included to ‘slope instability’ checklist
* 2700 Waimakariri homes at ‘high risk’ of flood in normal hazards maps

The procedures for land instability relate to sensitive routines – these are residential properties, visitor accommodation, community and education services and retirement properties – the sorts of activities most at danger from land instability dangers

The document, element of the region’s new Te Tai o Poutini Prepare, is readily available for community comments at a sequence of roadshows and general public drop-in meetings throughout the region this 7 days right up until Friday.

It contains parts at the moment recognized in the Gray, Westland and Buller District Programs as being topic to significant land instability.

Impacted parts incorporate:

  • Little Wanganui
  • Mokihinui to Ngakawau
  • Sections of the Coast Street (north of Fox River, Maybelle Bay, Fourteen Mile, 10 Mile, Rapahoe Bluff)
  • Greymouth erosion prone space
  • Otira and Knights Issue.


The massive Alpine Fault is thanks for an additional massive earthquake and scientists have been drawing up a state of affairs of what the devastation would glimpse like. (To start with revealed May well 2018)


A Land Instability Hazard overlay is determined throughout the hills forming the backdrop of Greymouth – from the Kings Park area higher than the Greymouth CBD and adhering to the coastal strip to Paroa.

This contains the Twelve Apostles Assortment and the hills behind Greymouth and Paroa down to Marsden Rd and across in direction of Boddytown and Marsden.

The land instability map covers quite a big spot, like spots zoned for further more development of Greymouth.

The draft doc claims these parts are envisioned to be equipped to be produced, but will involve pretty precise engineering layout of foundations to regulate the hazards of the sluggish slip erosion developing there.

Accordingly, a source consent will be desired to help that possibility evaluation.

Rockfalls are a risk near Rapahoe and on the Coast Road.


Rockfalls are a possibility around Rapahoe and on the Coast Street.

Rapahoe and Coast Highway rockfalls

The Coast Road is matter to land instability from rockfalls at 10 Mile and Rapahoe Bluff, just north of the Rapahoe residential spot.

New sensitive things to do this sort of as residential or customer accommodation will involve a resource consent for all those spots with a required hazard evaluation to recognize how the rockfall risk can be mitigated, this sort of as by unique engineering layout or defense operates.


Punakaiki township is subject to several dangers like threats from the coast and also the hills above.

Punakaiki is at risk from rockfall and threats from the coast.


Punakaiki is at possibility from rockfall and threats from the coast.

The spot underneath the cliffs in Punakaiki discovered in the land instability overlay has a superior danger of rockfall.

In this spot new delicate functions these types of as properties and visitor lodging will have to have a useful resource consent – with a hazard assessment to exhibit how the constructing will be safeguarded from the rockfall hazard.

Very little Wanganui

Minimal Wanganui is affected by equally coastal hazards, and in the subdivision region, rockfall hazards.

The full Minimal Wanganui subdivision spot is coated by the land instability overlay, thanks to the major hazards from rockfall.

New houses or baches will have to have a useful resource consent, with a in-depth rockfall hazard assessment to detect how the possibility would be mitigated.

Coastal hazards and rockfall hazards put Little Wanganui at risk.


Coastal hazards and rockfall hazards put Minimal Wanganui at risk.

Present use legal rights

The Purely natural Dangers rules in the Te Tai o Poutini Approach will not have an effect on the skill to continue current lawfully set up pursuits.

Exactly where there are current lawfully recognized properties in just a purely natural hazard (or other) overlay at the time of notification of the approach, individuals will have present use rights beneath the Resource Management Act.

Existing use rights signify a unique creating can proceed to be maintained and occupied without the need of the need to have to get a source consent beneath the approach.

Should really the constructing be ruined or harmed, then presented it is changed in 5 yrs, it can be replaced or reconstructed with a setting up of a equivalent size, spot and goal without having any will need for a resource consent, provided that the substitution creating does not raise the diploma to which the building fails to comply with the regulations in Te Tai o Poutini Strategy

The authorized requirement for a alternative is 12 months – this timeframe has been prolonged less than the draft as replacement constructing can take far more time.

The making that replaces a ruined or ruined creating does not have to be equivalent to the unique making, just has to be “the same or related in character, intensity and scale”.